Culture of Mysis prawns
(1) in the 1970s, Mysis prawns were cultured in Shantou, Guangdong and Fujian, or collected from natural waters as bait for seahorses; Rizhao Mariculture Experimental ground in Shandong Province used soil ponds to cultivate black and brown bran shrimp and achieved good results. At present, the biology of black-brown prawns has been deeply studied along the coast of Shandong, China; in Japan, common prawns, Japanese prawns, perfect prawns and medium-sized prawns have all been studied in vivo or fishery biology. all these species can be classified as culture species.
(2) the common species of Mysis shrimp collected along the coast are all juvenile shrimp with a body length of 2mm, and most of the adult length is between 5mm and 15mm, which belongs to large species in the plankton community. Summer cloth or mosquito net cloth can be used for collection, and even plastic window screens can be used to make handmade nets or dragging nets for collection. Collection sites should be selected to observe the distribution of prawns, large resources, and convenient transportation and operation of the water area. Most of the prawns are reproductive before and after dawn, and should be harvested in the morning, especially in summer, when the weather is muggy, and should be harvested at dawn or sunrise. In winter, it can be collected around noon. Mysis prawns are small shrimps that swim at the bottom, and some species live in the sediment at the bottom of the shore. The body color of the prawns varies with the living environment. If the species living along the coast are lurking, it is difficult to see the existence of the prawns. Live in brackish waters of the shrimp, transparent body color, such as the Japanese new bran shrimp living in the water plants, do not touch the water plants, it is difficult to see bran shrimp. Therefore, when collecting and catching, the net with handle must be used to push forward or touch the aquatic plants near the bottom (do not muddy the water), so as to frighten the upper reaches of the prawns and then collect them. Should not be too much, if the transportation distance is not far, the time is not long, do not need to be inflated. Of course, using a battery pump to inflate during transportation is more effective in preventing hypoxia.
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How to prevent and control diseases of pollution-free fish
Animal and plant symbiosis aquatic plants and fish symbiosis in the same pond, fish rarely get sick. The aquatic plants planted in the fish pond are rice or lotus root, which are in the east-west direction, with a wide row spacing (more than 33 cm), accounting for no more than 50% of the total area of the water body, so that the lighting effect is good, and the water depth depends on the water tolerance of aquatic plants. Rice is generally less than 30 cm, and lotus root can reach more than 50 cm. Farmed fish can be conventional, famous and special new species. Breeding methods can be used for seedling cultivation and adult fish culture. Due to the deposition of residual bait, fish droppings, etc.
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Carbon dioxide and carbonic acid assist live fish transport
Carbon dioxide-assisted live fish transport is a new technology that keeps live fish asleep for a long time to reduce transportation costs. When carbon dioxide is used to assist the transport of adult carp, the adult carp must be alternately perfused with carbon dioxide gas containing high partial pressure (27-33KPa) and low partial pressure (13-17KPa). The transportation time can be maintained for about 10 hours, and the mortality rate is very low. The transport of live fish can also be assisted by a mixture of carbon dioxide and oxygen (50:50). At this time, you can go directly to the crucian carp and
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